| The objective of the study was to evaluate the feasibility of Water Hyacinth (WH) Stem-leaf used as ruminant feed, which may be beneficial to both feed resource and environmental protection. The study contain three parts:The effects of pollutional elements in water on the corresponding elements constitute in WH (part 1), the modulation technique of WH silage (part 2), the effects of feeding WH silage on sheep (part 3).Part 1 This part mainly researched The effects of pollutional elements in water on the corresponding elements constitute in WH, elements include four heavy metals(Pb, Cd, Cr,Hg) and N,P. Water hyacinth and water samples were taken from eight different water areas in Jinghua, Shaoxin cities et al of Zhejiang province, measured the content of heavy metals and N,P in the samples. The results showed:the content of Pb, Cd, Cr,Hg in root are higher than stem-leaf 46.1%,24.7%,53.4% and 71.4%, respectively. Under this experimental conditions, Content of in root and stem-leaf had rising trend with the increase of Pb, Cr in water. The content of metals are within the parameters of national standard. Content of N and P in root are higher than stem-leaf 34.6% and 123%, respectively. The contents of N and P in both root and stem-leaf of water hyacinth have fluctuate with the increase of corresponding N and P in water, but no escalating trend.Part 2 This experiment studied the ensile techniques of water hyacinth stem-leaf. It includes into two experiments.Expt 1 This experiment had four experimental treatments:the control group, 4% beet pulp group,1% sucrose group,4% beet pulp and 1% sucrose group. The pre-dry WH and additives were mixed and put into vacuum storage bags (29*33cm) at room temperature. After ensiled for 60 days, the silage quality of the Water Hyacinth Stem-leaf was evaluated. The results showed that:Compared with the control group, after adding sucrose or beet pulp, CP content were significantly decreased, and the mixed group had the lowest value, which decreased by 4.22% (P< 0.05). The pH of 4% beet pulp group and mixed group were significantly decreased by 6.07%,6.29% respectively (P<0.05). The mixed group had the highest OMD value, higher than the control groups by 9.58%, slightly higher than the 4% beet dregs group (9.05%). Sum up, mixed group and 4% beet pulp group were better than others.Expt 2 This study was conducted by 2×3 two factors randomized trial design, to determine the effect of addition of urea and beet pulp on silage quality. The level of urea were 0,0.2% respectively(on pre-dry material), and beet pulp were 0,4 and 8% respectively (on pre-dry material). Silage method was the same as the above. The results showed that the crude protein (CP) of the 4% and 8% beet pulp treatments were decreased by 3.4% and 8.9%, respectively, compared with the control group (P < 0.05); at the same time, the dry matter of siliges were slightly improved.4% beet pulp group had the lowest pH value and the highest lactic acid content, achieved a good level of silage. The treatment which added 0.2% urea only had improved the proportion of CP effectively at 11.6%, but it appeared some rotten phenomenon, the pH value and the ammonia N were increased significantly(P< 0.05).4% urea and 0.2% beet pulp mixed silage had not bad apparent and increased the CP contents significantly, the index of OMD,24h gas production, potential gas production of this group were higher than the control group 13.2%,34.7%,28.4%, respectively. In conclusion, the two treatments which added 4% beet pulp had the better silage quality.Part 3 We chose 4% beet pulp and 0.2% urea mix trentment, and processed a small-scale silage, to value the effect of water hyacinth silage on feeding sheep. In this study the complex 3*3 Latin square was designed,3 treatments, each dealing with two sheep. Three treatments were Guineagrass group:200g concentrate＋ample guineagrass; Mix group:200g concentrate＋150g guineagrass＋ample ensile; WH group:200g concentrate＋ample ensile. The results show that:The average daily gain of Mix group was 2.5 times of Guineagrass group (P> 0.05). The weight of WH group showed downward trend by 29.8g/d. The apparent digestibility of DM, OM, CP, NDF and ADF of Mix group are the highest, slightly higher than Guineagrass group, extra range not more than 5% (P> 0.05). The average pH and ammonia N of Mix group were between Guineagrass group and WH group, which closer to the optimum rumen fermentation range. pH reached the the lowest value after ingestion 3 hours, NH3-N got maximum content after ingestion 1 hour. From the above, guinea grass and water hyacinth silage mix feed group was better than feed guinea grass or water hyacinth silage alone.In summary, water hyacinth silage added urea and beet pulp, feed sheep together with guinea grass, can achieve well feeding results.
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